You said massive impact. I'm not seeing it, sorry. If anything they're now a liability at the national stage for the GOP and I feel sorry for anyone living in areas where Tea Party candidates have gained a local edge.
The comparison to Occupy is pretty specious, imo. The original Tea Party got co-opted to hell and back by the GOP after Obama got elected. If Occupy had the same kind of financial backing that the Tea Party got by acquiescing to the GOP, they might be in the same place.
But honestly, Occupy never sought to take the slow, local politics route (even if I might agree with that notion that is the smart way to go). They don't like Democrats the same way the Tea Party likes the GOP so there's that too.